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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site direct vent heater A type of combustion heating system in which combustion air is drawn directly from outside and the products of combustion are vented directly outside. These features are beneficial in tight, energy-efficient homes because they will not depressurize a home and cause air infiltration, and backdrafting of other combustion appliances. For more details, see direct-vent fireplace. Related category    • HEATING Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP